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package com.taobao.android.builder.tools.classinject;

import com.alibaba.fastjson.JSON;
import javassist.*;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.util.*;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipOutputStream;

/**
 * Code injection is done through Javassist
 * Created by shenghua.nish on 2015-10-22 Again in the afternoon.
 */
public class CodeInjectByJavassist {

    public static Map<String, ClazzInjecter> sInjecterMap = new HashMap<String, ClazzInjecter>();

    private static Logger logger = LoggerFactory.getLogger(CodeInjectByJavassist.class);

    public synchronized static byte[] inject(ClassPool pool,
                                             String className,
                                             InjectParam injectParam) throws Exception {

        CtClass cc = pool.get(className);
        cc.defrost();
        if (className.equalsIgnoreCase("android.taobao.atlas.framework.FrameworkProperties") ||
            className.equalsIgnoreCase("android.taobao.atlas.version.VersionKernal")) {

            if (StringUtils.isNotBlank(injectParam.version)) {
                CtClass ctClass = pool.get("java.lang.String");
                CtField ctField = new CtField(ctClass, "version", cc);
                ctField.setModifiers(Modifier.PRIVATE);
                CtMethod ctMethod = CtNewMethod.getter("getVersion", ctField);
                ctMethod.setModifiers(Modifier.PUBLIC);
                CtField.Initializer initializer = CtField.Initializer.constant(injectParam.version);
                try {
                    cc.removeField(ctField);

                }catch (Exception e){

                }
                cc.addField(ctField, initializer);
                try {
                    cc.removeMethod(ctMethod);
                }catch (Exception e){

                }
                cc.addMethod(ctMethod);
                logger.info(
                    "[android.taobao.atlas.framework.FrameworkProperties] inject version " +
                        injectParam.version);
            }

            addField(pool, cc, "bundleInfo", injectParam.bundleInfo);
            addField(pool, cc, "autoStartBundles", injectParam.autoStartBundles);
            addField(pool, cc, "preLaunch", injectParam.preLaunch);
            addField(pool, cc, "group", injectParam.group);
            addField(pool, cc, "outApp", String.valueOf(injectParam.outApp));
            addField(pool, cc, "autoStart", String.valueOf(injectParam.autoStart));
            addField(pool, cc, "blackDialogActivity", String.valueOf(injectParam.blackDialogActivity));


            if (null != injectParam.outputFile) {
                Map output = new HashMap();
                output.put("bundleInfo", JSON.parseArray(injectParam.bundleInfo));
                output.put("autoStartBundles", injectParam.autoStartBundles);
                output.put("preLaunch", injectParam.preLaunch);
                output.put("group", injectParam.group);
                output.put("outApp", injectParam.outApp);
                output.put("unit_tag", injectParam.unit_tag);
                output.put("autoStart",injectParam.autoStart);
                output.put("blackDialogActivity",injectParam.blackDialogActivity);
                FileUtils.write(injectParam.outputFile, JSON.toJSONString(output, true));
            }

        }

        ClazzInjecter clazzInjecter = sInjecterMap.get(className);
        if (null != clazzInjecter) {
            Map<String, String> stringMap = clazzInjecter.getInjectFields();
            if (!stringMap.isEmpty()) {
                for (String key : stringMap.keySet()) {
                    addField(pool, cc, key, stringMap.get(key));
                }
            }
        }

        if (!injectParam.removePreverify) {
            Collection<String> refClasses = cc.getRefClasses();
            if (refClasses.contains("com.taobao.verify.Verifier")) {
                return cc.toBytecode();
            }
            boolean flag = false;
            if (className.equalsIgnoreCase("com.ut.mini.crashhandler.IUTCrashCaughtListner")) {
                flag = true;
            }

            if (cc.isInterface()) {
                final CtClass defClass = pool.get(Class.class.getName());
                CtField defField = new CtField(defClass, "_inject_field__", cc);
                defField.setModifiers(Modifier.STATIC | Modifier.PUBLIC | Modifier.FINAL);
                cc.addField(defField,
                            CtField.Initializer.byExpr(
                                "Boolean.TRUE.booleanValue()?java.lang.String.class:com.taobao.verify.Verifier"
                                    + ".class;"));
            } else {
                CtConstructor[] ctConstructors = cc.getDeclaredConstructors();
                if (null != ctConstructors && ctConstructors.length > 0) {
                    CtConstructor ctConstructor = ctConstructors[0];
                    ctConstructor.insertBeforeBody(
                        "if(Boolean.FALSE.booleanValue()){java.lang.String.valueOf(com.taobao.verify.Verifier"
                            + ".class);}");
                } else {
                    final CtClass defClass = pool.get(Class.class.getName());
                    CtField defField = new CtField(defClass, "_inject_field__", cc);
                    defField.setModifiers(Modifier.STATIC);
                    cc.addField(defField,
                                CtField.Initializer.byExpr(
                                    "Boolean.TRUE.booleanValue()?java.lang.String.class:com.taobao.verify"
                                        + ".Verifier.class;"));
                }
            }
        }
        return cc.toBytecode();

    }

    private static void addField(ClassPool pool,
                                 CtClass cc,
                                 String key,
                                 String value) throws NotFoundException, CannotCompileException {
        if (StringUtils.isNotBlank(value)) {
            try {
                cc.removeField(cc.getField(key));
            } catch (NotFoundException notfoundException) {
            }
            logger.info("inject key " + key + "->" + value);
            CtClass ctClass = pool.get("java.lang.String");
            CtField ctField = new CtField(ctClass, key, cc);
            ctField.setModifiers(Modifier.STATIC | Modifier.PUBLIC);
            CtField.Initializer initializer = CtField.Initializer.constant(value);
            cc.addField(ctField, initializer);
        }
    }

    /**
     * Inject replacement operations for class files in the specified folder
     *
     * @param pool
     * @param folder
     * @param outFolder
     * @return
     * @throws IOException
     * @throws CannotCompileException
     * @throws NotFoundException
     * @throws Exception
     */
    public static List<String> injectFolder(ClassPool pool,
                                            File folder,
                                            File outFolder,
                                            InjectParam injectParam) throws Exception {
        List<String> errorFiles = new ArrayList<String>();
        if (folder.exists() && folder.isDirectory()) {
            Collection<File> classFiles = FileUtils.listFiles(folder, new String[] {"class"}, true);
            for (File classFile : classFiles) {
                String className = toRelative(folder, classFile.getAbsolutePath());
                File outClassFile = new File(outFolder, className);
                outClassFile.getParentFile().mkdirs();
                className = StringUtils.replace(className, File.separator, ".");
                className = className.substring(0, className.length() - 6);
                byte[] codes;

                codes = inject(pool, className, injectParam);
                FileUtils.writeByteArrayToFile(outClassFile, codes);

            }
        }
        return errorFiles;
    }

    /**
     * The injection of code for the specified jar package
     *
     * @param inJar
     * @param outJar
     * @throws IOException
     * @throws NotFoundException
     * @throws CannotCompileException
     */
    public static List<String> inject(ClassPool pool,
                                      File inJar,
                                      File outJar,
                                      InjectParam injectParam) throws Exception {
        List<String> errorFiles = new ArrayList<String>();
        JarFile jarFile = newJarFile(inJar);

        outJar.getParentFile().mkdirs();
        FileOutputStream fileOutputStream = new FileOutputStream(outJar);
        JarOutputStream jos = new JarOutputStream(new BufferedOutputStream(fileOutputStream));
        Enumeration<JarEntry> jarFileEntries = jarFile.entries();
        JarEntry jarEntry = null;
        while (jarFileEntries.hasMoreElements()) {
            jarEntry = jarFileEntries.nextElement();
            String name = jarEntry.getName();
            String className = StringUtils.replace(name, File.separator, "/");
            className = StringUtils.replace(className, "/", ".");
            className = StringUtils.substring(className, 0, className.length() - 6);
            if (!StringUtils.endsWithIgnoreCase(name, ".class")) {
                InputStream inputStream = jarFile.getInputStream(jarEntry);
                copyStreamToJar(inputStream, jos, name, jarEntry.getTime(), jarEntry);
                IOUtils.closeQuietly(inputStream);
            } else {
                byte[] codes;

                codes = inject(pool, className, injectParam);
                InputStream classInstream = new ByteArrayInputStream(codes);
                copyStreamToJar(classInstream, jos, name, jarEntry.getTime(), jarEntry);

            }
        }
        jarFile.close();
        IOUtils.closeQuietly(jos);
        return errorFiles;
    }

    private static void copyStreamToJar(InputStream zin,
                                        ZipOutputStream out,
                                        String currentName,
                                        long fileTime,
                                        ZipEntry zipEntry) throws IOException {
        // Create new entry for zip file.
        ZipEntry newEntry = new ZipEntry(currentName);

        // Make sure there is date and time set.
        if (fileTime != -1) {
            newEntry.setTime(fileTime); // If found set it into output file.
        }
        out.putNextEntry(newEntry);
        if (zin != null) {
            IOUtils.copy(zin, out);
        }
    }

    private static JarFile newJarFile(File jar) throws IOException {
        try {
            return new JarFile(jar);
        } catch (ZipException zex) {
            throw new ZipException("error in opening zip file " + jar);
        }
    }

    public static String toRelative(File basedir, String absolutePath) {
        absolutePath = absolutePath.replace('\\', '/');
        String basedirPath = basedir.getAbsolutePath().replace('\\', '/');
        String relative;
        if (absolutePath.startsWith(basedirPath)) {
            relative = absolutePath.substring(basedirPath.length());
            if (relative.startsWith("/")) {
                relative = relative.substring(1);
            }

            if (relative.length() <= 0) {
                relative = ".";
            }
        } else {
            relative = absolutePath;
        }

        return relative;
    }
}
